fix: decoders two cases. With tinyauth prefix for env and without for flags

* refactor: rework decoders logic for cleaner code

* refactor: use strcase lib to handle text case conversions

cmd/root.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"os"
 	"strings"
 	"tinyauth/internal/bootstrap"
 	"tinyauth/internal/config"
@@ -16,13 +17,14 @@ import (
 type rootCmd struct {
 	root     *cobra.Command
 	cmd      *cobra.Command
-
 	viper    *viper.Viper
+	aclFlags map[string]string
 }
 
 func newRootCmd() *rootCmd {
 	return &rootCmd{
 		viper:    viper.New(),
+		aclFlags: make(map[string]string),
 	}
 }
 
@@ -32,6 +34,9 @@ func (c *rootCmd) Register() {
 		Short: "The simplest way to protect your apps with a login screen",
 		Long:  `Tinyauth is a simple authentication middleware that adds a simple login screen or OAuth with Google, Github or any other provider to all of your docker apps.`,
 		Run:   c.run,
+		FParseErrWhitelist: cobra.FParseErrWhitelist{
+			UnknownFlags: true,
+		},
 	}
 
 	c.viper.AutomaticEnv()
@@ -116,7 +121,7 @@ func (c *rootCmd) run(cmd *cobra.Command, args []string) {
 		log.Warn().Msg("Log level set to trace, this will log sensitive information!")
 	}
 
-	app := bootstrap.NewBootstrapApp(conf)
+	app := bootstrap.NewBootstrapApp(conf, c.aclFlags)
 
 	err = app.Setup()
 	if err != nil {
@@ -126,6 +131,8 @@ func (c *rootCmd) run(cmd *cobra.Command, args []string) {
 
 func Run() {
 	rootCmd := newRootCmd()
+	rootCmd.aclFlags = utils.ExtractACLFlags(os.Args[1:])
+
 	rootCmd.Register()
 	root := rootCmd.GetCmd()
 

go.mod

@@ -47,6 +47,7 @@ require (
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/quic-go/quic-go v0.54.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/stoewer/go-strcase v1.3.1 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.34.0 // indirect

go.sum

@@ -259,6 +259,8 @@ github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.21.0 h1:x5S+0EU27Lbphp4UKm1C+1oQO+rKx36vfCoaVebLFSU=
 github.com/spf13/viper v1.21.0/go.mod h1:P0lhsswPGWD/1lZJ9ny3fYnVqxiegrlNrEmgLjbTCAY=
+github.com/stoewer/go-strcase v1.3.1 h1:iS0MdW+kVTxgMoE1LAZyMiYJFKlOzLooE4MxjirtkAs=
+github.com/stoewer/go-strcase v1.3.1/go.mod h1:fAH5hQ5pehh+j3nZfvwdk2RgEgQjAoM8wodgtPmh1xo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=

internal/bootstrap/app_bootstrap.go

@@ -38,12 +38,14 @@ type Service interface {
 
 type BootstrapApp struct {
 	config   config.Config
+	aclFlags map[string]string
 	uuid     string
 }
 
-func NewBootstrapApp(config config.Config) *BootstrapApp {
+func NewBootstrapApp(config config.Config, aclFlags map[string]string) *BootstrapApp {
 	return &BootstrapApp{
 		config:   config,
+		aclFlags: aclFlags,
 	}
 }
 
@@ -140,6 +142,7 @@ func (app *BootstrapApp) Setup() error {
 	// Create services
 	dockerService := service.NewDockerService()
 	aclsService := service.NewAccessControlsService(dockerService)
+	aclsService.SetACLFlags(app.aclFlags)
 	authService := service.NewAuthService(authConfig, dockerService, ldapService, database)
 	oauthBrokerService := service.NewOAuthBrokerService(oauthProviders)
 

internal/config/config.go

@@ -53,16 +53,16 @@ type Claims struct {
 }
 
 type OAuthServiceConfig struct {
-	ClientID           string   `key:"client-id"`
+	ClientID           string `field:"client-id"`
-	ClientSecret       string   `key:"client-secret"`
+	ClientSecret       string
-	ClientSecretFile   string   `key:"client-secret-file"`
+	ClientSecretFile   string
-	Scopes             []string `key:"scopes"`
+	Scopes             []string
-	RedirectURL        string   `key:"redirect-url"`
+	RedirectURL        string `field:"redirect-url"`
-	AuthURL            string   `key:"auth-url"`
+	AuthURL            string `field:"auth-url"`
-	TokenURL           string   `key:"token-url"`
+	TokenURL           string `field:"token-url"`
-	UserinfoURL        string   `key:"user-info-url"`
+	UserinfoURL        string `field:"user-info-url"`
-	InsecureSkipVerify bool     `key:"insecure-skip-verify"`
+	InsecureSkipVerify bool
-	Name               string   `key:"name"`
+	Name               string
 }
 
 var OverrideProviders = map[string]string{

internal/service/access_controls_service.go

@@ -4,7 +4,7 @@ import (
 	"os"
 	"strings"
 	"tinyauth/internal/config"
-	"tinyauth/internal/utils/decoders"
+	"tinyauth/internal/utils"
 
 	"github.com/rs/zerolog/log"
 )
@@ -12,62 +12,31 @@ import (
 type AccessControlsService struct {
 	docker   *DockerService
 	envACLs  config.Apps
+	aclFlags map[string]string
 }
 
 func NewAccessControlsService(docker *DockerService) *AccessControlsService {
 	return &AccessControlsService{
 		docker:   docker,
+		aclFlags: make(map[string]string),
 	}
 }
 
+func (acls *AccessControlsService) SetACLFlags(flags map[string]string) {
+	acls.aclFlags = flags
+}
+
 func (acls *AccessControlsService) Init() error {
-	acls.envACLs = config.Apps{}
 	env := os.Environ()
-	appEnvVars := []string{}
 
-	for _, e := range env {
+	apps, err := utils.GetACLsConfig(env, acls.aclFlags)
-		if strings.HasPrefix(e, "TINYAUTH_APPS_") {
-			appEnvVars = append(appEnvVars, e)
-		}
-	}
-
-	err := acls.loadEnvACLs(appEnvVars)
-
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (acls *AccessControlsService) loadEnvACLs(appEnvVars []string) error {
-	if len(appEnvVars) == 0 {
-		return nil
-	}
-
-	envAcls := map[string]string{}
-
-	for _, e := range appEnvVars {
-		parts := strings.SplitN(e, "=", 2)
-		if len(parts) != 2 {
-			continue
-		}
-
-		// Normalize key, this should use the same normalization logic as in utils/decoders/decoders.go
-		key := parts[0]
-		key = strings.ToLower(key)
-		key = strings.ReplaceAll(key, "_", ".")
-		value := parts[1]
-		envAcls[key] = value
-	}
-
-	apps, err := decoders.DecodeLabels(envAcls)
 
 	if err != nil {
 		return err
 	}
 
 	acls.envACLs = apps
+
 	return nil
 }
 

internal/utils/app_utils.go

@@ -147,7 +147,7 @@ func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[st
 		}
 	}
 
-	envProviders, err := decoders.DecodeEnv(envMap)
+	envProviders, err := decoders.DecodeEnv[config.Providers, config.OAuthServiceConfig](envMap, "providers")
 
 	if err != nil {
 		return nil, err
@@ -167,7 +167,7 @@ func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[st
 		}
 	}
 
-	flagProviders, err := decoders.DecodeFlags(flagsMap)
+	flagProviders, err := decoders.DecodeFlags[config.Providers, config.OAuthServiceConfig](flagsMap, "providers")
 
 	if err != nil {
 		return nil, err
@@ -208,3 +208,53 @@ func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[st
 	// Return combined providers
 	return providers, nil
 }
+
+func GetACLsConfig(env []string, flagsMap map[string]string) (config.Apps, error) {
+	apps := config.Apps{Apps: make(map[string]config.App)}
+
+	envMap := make(map[string]string)
+
+	for _, e := range env {
+		pair := strings.SplitN(e, "=", 2)
+		if len(pair) == 2 {
+			envMap[pair[0]] = pair[1]
+		}
+	}
+
+	envApps, err := decoders.DecodeACLEnv[config.Apps](envMap, "apps")
+
+	if err != nil {
+		return config.Apps{}, err
+	}
+
+	if envApps.Apps != nil {
+		maps.Copy(apps.Apps, envApps.Apps)
+	}
+
+	flagApps, err := decoders.DecodeACLFlags[config.Apps](flagsMap, "apps")
+
+	if err != nil {
+		return config.Apps{}, err
+	}
+
+	if flagApps.Apps != nil {
+		maps.Copy(apps.Apps, flagApps.Apps)
+	}
+
+	return apps, nil
+}
+
+func ExtractACLFlags(args []string) map[string]string {
+	aclFlags := make(map[string]string)
+
+	for _, arg := range args {
+		if strings.HasPrefix(arg, "--apps-") || strings.HasPrefix(arg, "--tinyauth-apps-") {
+			pair := strings.SplitN(arg[2:], "=", 2)
+			if len(pair) == 2 {
+				aclFlags[pair[0]] = pair[1]
+			}
+		}
+	}
+
+	return aclFlags
+}

internal/utils/decoders/decoders.go

@@ -3,29 +3,89 @@ package decoders
 import (
 	"reflect"
 	"strings"
-	"tinyauth/internal/config"
+
+	"github.com/stoewer/go-strcase"
 )
 
-func NormalizeKeys(keys map[string]string, rootName string, sep string) map[string]string {
+func ParsePath(parts []string, idx int, t reflect.Type) []string {
-	normalized := make(map[string]string)
+	if idx >= len(parts) {
-	knownKeys := getKnownKeys()
+		return []string{}
-
-	for k, v := range keys {
-		var finalKey []string
-		var suffix string
-		var camelClientName string
-		var camelField string
-
-		finalKey = append(finalKey, rootName)
-		finalKey = append(finalKey, "providers")
-		lowerKey := strings.ToLower(k)
-
-		if !strings.HasPrefix(lowerKey, "providers"+sep) {
-			continue
 	}
 
+	if t.Kind() == reflect.Map {
+
+		if idx >= len(parts) {
+			return []string{}
+		}
+
+		elemType := t.Elem()
+		keyEndIdx := idx + 1
+
+		if elemType.Kind() == reflect.Struct {
+			for i := idx + 1; i < len(parts); i++ {
+				found := false
+
+				for j := 0; j < elemType.NumField(); j++ {
+					field := elemType.Field(j)
+					if strings.EqualFold(parts[i], field.Name) {
+						keyEndIdx = i
+						found = true
+						break
+					}
+				}
+
+				if found {
+					break
+				}
+			}
+		}
+
+		keyParts := parts[idx:keyEndIdx]
+		keyName := strings.ToLower(strings.Join(keyParts, "_"))
+
+		rest := ParsePath(parts, keyEndIdx, elemType)
+		result := append([]string{keyName}, rest...)
+		return result
+	}
+
+	if t.Kind() == reflect.Struct {
+		for i := 0; i < t.NumField(); i++ {
+			field := t.Field(i)
+			if field.Type.Kind() == reflect.Map {
+				rest := ParsePath(parts, idx, field.Type)
+				if len(rest) > 0 {
+					return rest
+				}
+			}
+		}
+
+		for i := 0; i < t.NumField(); i++ {
+			field := t.Field(i)
+			if strings.EqualFold(parts[idx], field.Name) {
+				rest := ParsePath(parts, idx+1, field.Type)
+				result := append([]string{strings.ToLower(field.Name)}, rest...)
+				return result
+			}
+		}
+	}
+
+	return []string{}
+}
+
+func normalizeKeys[T any](input map[string]string, root string, sep string) map[string]string {
+	knownKeys := getKnownKeys[T]()
+	normalized := make(map[string]string)
+
+	for k, v := range input {
+		parts := []string{"tinyauth"}
+
+		key := strings.ToLower(k)
+		key = strings.ReplaceAll(key, sep, "-")
+
+		suffix := ""
+
 		for _, known := range knownKeys {
-			if strings.HasSuffix(lowerKey, strings.ReplaceAll(known, "-", sep)) {
+			if strings.HasSuffix(key, known) {
 				suffix = known
 				break
 			}
@@ -35,55 +95,101 @@ func NormalizeKeys(keys map[string]string, rootName string, sep string) map[stri
 			continue
 		}
 
-		if strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(lowerKey, "providers"+sep), strings.ReplaceAll(suffix, "-", sep))) == "" {
+		parts = append(parts, root)
+
+		id := strings.TrimPrefix(key, root+"-")
+		id = strings.TrimSuffix(id, "-"+suffix)
+
+		if id == "" {
 			continue
 		}
 
-		clientNameParts := strings.Split(strings.TrimPrefix(strings.TrimSuffix(lowerKey, sep+strings.ReplaceAll(suffix, "-", sep)), "providers"+sep), sep)
+		parts = append(parts, id)
+		parts = append(parts, suffix)
 
-		for i, p := range clientNameParts {
+		final := ""
-			if i == 0 {
+
-				camelClientName += p
+		for i, part := range parts {
-				continue
+			if i > 0 {
+				final += "."
 			}
-			if p == "" {
+			final += strcase.LowerCamelCase(part)
-				continue
-			}
-			camelClientName += strings.ToUpper(string([]rune(p)[0])) + string([]rune(p)[1:])
 		}
 
-		finalKey = append(finalKey, camelClientName)
+		normalized[final] = v
-
-		fieldParts := strings.Split(suffix, "-")
-
-		for i, p := range fieldParts {
-			if i == 0 {
-				camelField += p
-				continue
-			}
-			if p == "" {
-				continue
-			}
-			camelField += strings.ToUpper(string([]rune(p)[0])) + string([]rune(p)[1:])
-		}
-
-		finalKey = append(finalKey, camelField)
-		normalized[strings.Join(finalKey, ".")] = v
 	}
 
 	return normalized
 }
 
-func getKnownKeys() []string {
+func getKnownKeys[T any]() []string {
-	var known []string
+	var keys []string
+	var t T
 
-	p := config.OAuthServiceConfig{}
+	v := reflect.ValueOf(t)
-	v := reflect.ValueOf(p)
+	typeOfT := v.Type()
-	typeOfP := v.Type()
 
-	for field := range typeOfP.NumField() {
+	for field := range typeOfT.NumField() {
-		known = append(known, typeOfP.Field(field).Tag.Get("key"))
+		if typeOfT.Field(field).Tag.Get("field") != "" {
+			keys = append(keys, typeOfT.Field(field).Tag.Get("field"))
+			continue
+		}
+		keys = append(keys, strcase.KebabCase(typeOfT.Field(field).Name))
 	}
 
-	return known
+	return keys
+}
+
+func normalizeACLKeys[T any](input map[string]string, root string, sep string) map[string]string {
+	normalized := make(map[string]string)
+	var t T
+	rootType := reflect.TypeOf(t)
+
+	for k, v := range input {
+		parts := strings.Split(strings.ToLower(k), sep)
+
+		if len(parts) < 2 {
+			continue
+		}
+
+		// Two cases:
+		// 1. Keys starting with "tinyauth" (env vars): tinyauth_apps_...
+		// 2. Keys starting with root directly (flags): apps-...
+		startIdx := 0
+		if parts[0] == "tinyauth" {
+			if len(parts) < 3 {
+				continue
+			}
+			if parts[1] != root {
+				continue
+			}
+			startIdx = 2 // Skip "tinyauth" and root
+		} else if parts[0] == root {
+			startIdx = 1 // Skip root only
+		} else {
+			continue
+		}
+
+		if startIdx < len(parts) {
+			parsedParts := ParsePath(parts[startIdx:], 0, rootType)
+
+			if len(parsedParts) == 0 {
+				continue
+			}
+
+			final := "tinyauth." + root
+
+			for _, part := range parsedParts {
+				if strings.Contains(part, "_") {
+					final += "." + part
+				} else {
+					final += "." + strcase.LowerCamelCase(part)
+				}
+			}
+
+			normalized[final] = v
+		}
+	}
+
+	return normalized
 }

internal/utils/decoders/decoders_test.go

@@ -1,49 +0,0 @@
-package decoders_test
-
-import (
-	"testing"
-	"tinyauth/internal/utils/decoders"
-
-	"gotest.tools/v3/assert"
-)
-
-func TestNormalizeKeys(t *testing.T) {
-	// Test with env
-	test := map[string]string{
-		"PROVIDERS_CLIENT1_CLIENT_ID":                    "my-client-id",
-		"PROVIDERS_CLIENT1_CLIENT_SECRET":                "my-client-secret",
-		"PROVIDERS_MY_AWESOME_CLIENT_CLIENT_ID":          "my-awesome-client-id",
-		"PROVIDERS_MY_AWESOME_CLIENT_CLIENT_SECRET_FILE": "/path/to/secret",
-		"I_LOOK_LIKE_A_KEY_CLIENT_ID":                    "should-not-appear",
-		"PROVIDERS_CLIENT_ID":                            "should-not-appear",
-	}
-	expected := map[string]string{
-		"tinyauth.providers.client1.clientId":                 "my-client-id",
-		"tinyauth.providers.client1.clientSecret":             "my-client-secret",
-		"tinyauth.providers.myAwesomeClient.clientId":         "my-awesome-client-id",
-		"tinyauth.providers.myAwesomeClient.clientSecretFile": "/path/to/secret",
-	}
-
-	normalized := decoders.NormalizeKeys(test, "tinyauth", "_")
-	assert.DeepEqual(t, normalized, expected)
-
-	// Test with flags (assume -- is already stripped)
-	test = map[string]string{
-		"providers-client1-client-id":                    "my-client-id",
-		"providers-client1-client-secret":                "my-client-secret",
-		"providers-my-awesome-client-client-id":          "my-awesome-client-id",
-		"providers-my-awesome-client-client-secret-file": "/path/to/secret",
-		"providers-should-not-appear-client":             "should-not-appear",
-		"i-look-like-a-key-client-id":                    "should-not-appear",
-		"providers-client-id":                            "should-not-appear",
-	}
-	expected = map[string]string{
-		"tinyauth.providers.client1.clientId":                 "my-client-id",
-		"tinyauth.providers.client1.clientSecret":             "my-client-secret",
-		"tinyauth.providers.myAwesomeClient.clientId":         "my-awesome-client-id",
-		"tinyauth.providers.myAwesomeClient.clientSecretFile": "/path/to/secret",
-	}
-
-	normalized = decoders.NormalizeKeys(test, "tinyauth", "-")
-	assert.DeepEqual(t, normalized, expected)
-}

internal/utils/decoders/env_decoder.go

@@ -1,20 +1,33 @@
 package decoders
 
 import (
-	"tinyauth/internal/config"
-
 	"github.com/traefik/paerser/parser"
 )
 
-func DecodeEnv(env map[string]string) (config.Providers, error) {
+func DecodeEnv[T any, C any](env map[string]string, subName string) (T, error) {
-	normalized := NormalizeKeys(env, "tinyauth", "_")
+	var result T
-	var providers config.Providers
 
-	err := parser.Decode(normalized, &providers, "tinyauth", "tinyauth.providers")
+	normalized := normalizeKeys[C](env, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
 
 	if err != nil {
-		return config.Providers{}, err
+		return result, err
 	}
 
-	return providers, nil
+	return result, nil
+}
+
+func DecodeACLEnv[T any](env map[string]string, subName string) (T, error) {
+	var result T
+
+	normalized := normalizeACLKeys[T](env, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
+
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
 }

internal/utils/decoders/env_decoder_test.go

@@ -9,52 +9,29 @@ import (
 )
 
 func TestDecodeEnv(t *testing.T) {
-	// Variables
+	// Setup
-	expected := config.Providers{
+	env := map[string]string{
-		Providers: map[string]config.OAuthServiceConfig{
+		"PROVIDERS_GOOGLE_CLIENT_ID":        "google-client-id",
-			"client1": {
+		"PROVIDERS_GOOGLE_CLIENT_SECRET":    "google-client-secret",
-				ClientID:           "client1-id",
+		"PROVIDERS_MY_GITHUB_CLIENT_ID":     "github-client-id",
-				ClientSecret:       "client1-secret",
+		"PROVIDERS_MY_GITHUB_CLIENT_SECRET": "github-client-secret",
-				Scopes:             []string{"client1-scope1", "client1-scope2"},
-				RedirectURL:        "client1-redirect-url",
-				AuthURL:            "client1-auth-url",
-				UserinfoURL:        "client1-user-info-url",
-				Name:               "Client1",
-				InsecureSkipVerify: false,
-			},
-			"client2": {
-				ClientID:           "client2-id",
-				ClientSecret:       "client2-secret",
-				Scopes:             []string{"client2-scope1", "client2-scope2"},
-				RedirectURL:        "client2-redirect-url",
-				AuthURL:            "client2-auth-url",
-				UserinfoURL:        "client2-user-info-url",
-				Name:               "My Awesome Client2",
-				InsecureSkipVerify: false,
-			},
-		},
-	}
-	test := map[string]string{
-		"PROVIDERS_CLIENT1_CLIENT_ID":            "client1-id",
-		"PROVIDERS_CLIENT1_CLIENT_SECRET":        "client1-secret",
-		"PROVIDERS_CLIENT1_SCOPES":               "client1-scope1,client1-scope2",
-		"PROVIDERS_CLIENT1_REDIRECT_URL":         "client1-redirect-url",
-		"PROVIDERS_CLIENT1_AUTH_URL":             "client1-auth-url",
-		"PROVIDERS_CLIENT1_USER_INFO_URL":        "client1-user-info-url",
-		"PROVIDERS_CLIENT1_NAME":                 "Client1",
-		"PROVIDERS_CLIENT1_INSECURE_SKIP_VERIFY": "false",
-		"PROVIDERS_CLIENT2_CLIENT_ID":            "client2-id",
-		"PROVIDERS_CLIENT2_CLIENT_SECRET":        "client2-secret",
-		"PROVIDERS_CLIENT2_SCOPES":               "client2-scope1,client2-scope2",
-		"PROVIDERS_CLIENT2_REDIRECT_URL":         "client2-redirect-url",
-		"PROVIDERS_CLIENT2_AUTH_URL":             "client2-auth-url",
-		"PROVIDERS_CLIENT2_USER_INFO_URL":        "client2-user-info-url",
-		"PROVIDERS_CLIENT2_NAME":                 "My Awesome Client2",
-		"PROVIDERS_CLIENT2_INSECURE_SKIP_VERIFY": "false",
 	}
 
-	// Test
+	expected := config.Providers{
-	res, err := decoders.DecodeEnv(test)
+		Providers: map[string]config.OAuthServiceConfig{
+			"google": {
+				ClientID:     "google-client-id",
+				ClientSecret: "google-client-secret",
+			},
+			"myGithub": {
+				ClientID:     "github-client-id",
+				ClientSecret: "github-client-secret",
+			},
+		},
+	}
+
+	// Execute
+	result, err := decoders.DecodeEnv[config.Providers, config.OAuthServiceConfig](env, "providers")
 	assert.NilError(t, err)
-	assert.DeepEqual(t, expected, res)
+	assert.DeepEqual(t, result, expected)
 }

internal/utils/decoders/flags_decoder.go

@@ -2,23 +2,38 @@ package decoders
 
 import (
 	"strings"
-	"tinyauth/internal/config"
 
 	"github.com/traefik/paerser/parser"
 )
 
-func DecodeFlags(flags map[string]string) (config.Providers, error) {
+func DecodeFlags[T any, C any](flags map[string]string, subName string) (T, error) {
-	filtered := filterFlags(flags)
+	var result T
-	normalized := NormalizeKeys(filtered, "tinyauth", "-")
-	var providers config.Providers
 
-	err := parser.Decode(normalized, &providers, "tinyauth", "tinyauth.providers")
+	filtered := filterFlags(flags)
+	normalized := normalizeKeys[C](filtered, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
 
 	if err != nil {
-		return config.Providers{}, err
+		return result, err
 	}
 
-	return providers, nil
+	return result, nil
+}
+
+func DecodeACLFlags[T any](flags map[string]string, subName string) (T, error) {
+	var result T
+
+	filtered := filterFlags(flags)
+	normalized := normalizeACLKeys[T](filtered, subName, "-")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
+
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
 }
 
 func filterFlags(flags map[string]string) map[string]string {

internal/utils/decoders/flags_decoder_test.go

@@ -9,52 +9,29 @@ import (
 )
 
 func TestDecodeFlags(t *testing.T) {
-	// Variables
+	// Setup
-	expected := config.Providers{
+	flags := map[string]string{
-		Providers: map[string]config.OAuthServiceConfig{
+		"--providers-google-client-id":        "google-client-id",
-			"client1": {
+		"--providers-google-client-secret":    "google-client-secret",
-				ClientID:           "client1-id",
+		"--providers-my-github-client-id":     "github-client-id",
-				ClientSecret:       "client1-secret",
+		"--providers-my-github-client-secret": "github-client-secret",
-				Scopes:             []string{"client1-scope1", "client1-scope2"},
-				RedirectURL:        "client1-redirect-url",
-				AuthURL:            "client1-auth-url",
-				UserinfoURL:        "client1-user-info-url",
-				Name:               "Client1",
-				InsecureSkipVerify: false,
-			},
-			"client2": {
-				ClientID:           "client2-id",
-				ClientSecret:       "client2-secret",
-				Scopes:             []string{"client2-scope1", "client2-scope2"},
-				RedirectURL:        "client2-redirect-url",
-				AuthURL:            "client2-auth-url",
-				UserinfoURL:        "client2-user-info-url",
-				Name:               "My Awesome Client2",
-				InsecureSkipVerify: false,
-			},
-		},
-	}
-	test := map[string]string{
-		"--providers-client1-client-id":            "client1-id",
-		"--providers-client1-client-secret":        "client1-secret",
-		"--providers-client1-scopes":               "client1-scope1,client1-scope2",
-		"--providers-client1-redirect-url":         "client1-redirect-url",
-		"--providers-client1-auth-url":             "client1-auth-url",
-		"--providers-client1-user-info-url":        "client1-user-info-url",
-		"--providers-client1-name":                 "Client1",
-		"--providers-client1-insecure-skip-verify": "false",
-		"--providers-client2-client-id":            "client2-id",
-		"--providers-client2-client-secret":        "client2-secret",
-		"--providers-client2-scopes":               "client2-scope1,client2-scope2",
-		"--providers-client2-redirect-url":         "client2-redirect-url",
-		"--providers-client2-auth-url":             "client2-auth-url",
-		"--providers-client2-user-info-url":        "client2-user-info-url",
-		"--providers-client2-name":                 "My Awesome Client2",
-		"--providers-client2-insecure-skip-verify": "false",
 	}
 
-	// Test
+	expected := config.Providers{
-	res, err := decoders.DecodeFlags(test)
+		Providers: map[string]config.OAuthServiceConfig{
+			"google": {
+				ClientID:     "google-client-id",
+				ClientSecret: "google-client-secret",
+			},
+			"myGithub": {
+				ClientID:     "github-client-id",
+				ClientSecret: "github-client-secret",
+			},
+		},
+	}
+
+	// Execute
+	result, err := decoders.DecodeFlags[config.Providers, config.OAuthServiceConfig](flags, "providers")
 	assert.NilError(t, err)
-	assert.DeepEqual(t, expected, res)
+	assert.DeepEqual(t, result, expected)
 }